Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9ef7a0fc5f9935…

MALICIOUS

PDF

78.1 KB Created: 2021-05-28 01:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1f3b75e5c6946b32ef818c7394e8d9f4 SHA-1: 534d60b34a92bcd25b72206a33109b9064f98264 SHA-256: 6a9ef7a0fc5f99359605b38db28b3093b20ce58dc645beee9417bd479395d566
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to Weebly and Strikingly hosted PDFs, suggesting a link farm or phishing operation. The primary URL, zajinet.ru, is likely part of this scheme to direct users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/strik?utm_term=chemistry+ionic+puzzle+piece+activity+answer+key PDF link annotation
    • https://kogavoduwesexup.weebly.com/uploads/1/3/4/6/134600755/tetosenadawom-jifav-zoxeloromor-lilama.pdfIn PDF document text
    • https://romemigevowuf.weebly.com/uploads/1/3/4/3/134335991/8274041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421461/normal_604fb34ed9450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474478/normal_600eafec488db.pdfIn PDF document text
    • https://sajaxelofokaxus.weebly.com/uploads/1/3/0/7/130776185/visenit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420907/normal_6037130c7fbd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503584/normal_5ffe748442d34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_6043be90d122e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386607/normal_6032d39a24698.pdfIn PDF document text
    • https://gepidoduxaw.weebly.com/uploads/1/3/5/3/135324144/9061571c40e9887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462038/normal_603eae5129def.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3f34666-8faa-453a-aba5-2959ac48a4d2/where_is_ntuser.dat_in_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4e7ab75-b6db-45a7-a6e5-c4cdcaa6f8bf/sakigajuletodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db82cdc6-e3ab-44a1-949c-2e78ef182ca0/92092061664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0a2bcfd-aeb1-46be-a8f9-a29d8f5b8eda/kixuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e5e31c4-75e3-4dca-ad88-8f730389aedb/follow_directions_on_a_coordinate_plane_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d9b51f5-9cde-4051-8bf0-2868818f431c/are_eureka_vacuum_filters_washable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68b42b3f-e1da-4f8c-983c-64e5a15ff01e/74386128146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/588b3da0-8284-4495-bdae-87e1f71d81b2/why_wont_my_ipad_find_my_airprint_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf079797-935f-4f3f-aae5-a4942dce8420/22147132037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33ddb5a3-1a1d-45a8-bf3d-13a532f4a896/how_to_turn_on_neat_scanner_nm-1000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f72d0a1-880f-4740-a80b-4b43178de099/memba_1-2-3_ciltlik_sohbet_kitab.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 5448 bytes
SHA-256: fea85116ef34aaf27a9040ddd13903e47dfac7305c633e13cb6d5eb542fe6d50
font_01_sfnt_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 12148 bytes
SHA-256: c49abd0af2bfb8b2788b2153fd542346d37c49c2e7212095f20b009a5b9d7e0b

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